Although these compounds are approved as food additives, they were not tested through burning which changes a chemicals properties. Depending on the tobacco cigarette tested, they can produce some 4000 chemical compounds when burned!

This information was gathered from Wikipedia and About.com. Please visit these sites for more information.http://en.wikipedia.org/wiki/List_of_additives_in_cigaretteshttp://quitsmoking.about.com/cs/nicotineinhaler/a/cigingredients.htm